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"!#$%!;6=>?7*+@!!+i&\(=[()Lk52()y!()?!6+-#$%6H:( ()+89+(-h6h(8!+Z+k5C-(7$%66:6=_7N=Nz++B&&z+()$*!lA h!#,6M2():+7_(6:6;!"!#$%!;67h#>"!#$%!!+hl(MC ()+N5l7[2+1(l"!#$%!&'(()*+l"!#$%!+9@+l"!#$%!;( q )?!@6:6;!"!#$%!;6(),("!#$%!&'(()*+#>;! "!#$%!7$%6 !HjD+-_(l+15k5Z9+(-62?+1665C8 h2(Y6:6DE6F;&'(()*+(>7+1"!=>+1("!6h(8]!786;C &:CH:(7+1l75$.6h!l_56S&l_C9zz!Z $.6(2#>&\($.66h9L`5+1(7.+l{!k52"&l6h6$*! 7\DE6F;&'(()*+($S!7@+62?l!b<<<<& / =><<<!+*{!@+=.+ 6:6\!+27(=+16 !6_(7@($(2l6M+l)S&);]!7875 _5#>6MC-5L7+N5>C6h(8#>&6;9+1((>+!5C,l!qC)2( ();!6'(H:)Y!DY2D|+l#>&6?#}# (l;:FZC)2#+,&+,l9L`5 ():+7_(h!#,!qC+15E!>9L 89{6H 67$%6=+1675_5Dg!)S&);l(2l6M+6h"!5_( (_H=>#>&6;9+1((>+!5C,&z+()$*!l!qC)26:6=_7Nh!D~!6M2 (?>6b5$+15E!>9Ll# (#\+,(z+6y7N(>+•!+,6E5l (+-(9-l6-(;?6Z+(+-D-H75"!#$%!&'(()*+]!6?6:6\!+2 795=A6&+N()5!€78!+Z+k5C-(=_7N(), PHẦN 1: TỔNG QUAN NGHIÊN CỨU 1.1. Tình hình sử dụng năng lượng mặt trời trên thế giới. 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